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D( v )
v = 0
v = 0
v = 0
v in (-oo:0) U (0:+oo)
-6 = 2/v // - 2/v
-(2/v)-6 = 0
-2*v^-1-6 = 0
-2*v^-1 = 6 // : -2
v^-1 = -3
-1 < 0
1/(v^1) = -3 // * v^1
1 = -3*v^1 // : -3
-1/3 = v^1
v = -1/3
v = -1/3
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